<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <h2>当前计数:{{counter}}</h2>
        <!-- <button v-on:click="counter++">+</button>
        <button v-on:click="counter--">-</button> -->
        <button v-on:click="add">+</button>
        <button v-on:click="sub">-</button>

        
    </div>
    <script src="../js/vue.js">
    </script>
    <script>
        const app=new Vue({
            el:'#app',
            data:{
                counter:0
            },
            methods:{
                add:function(){
                        console.log('add被执行')
                        this.counter++
                },
                sub:function(){
                        console.log('sub被执行')
                        this.counter--
                },
                created:function(){
                    console.log('created')
                },
                mounted:function(){
                    console.log('mounted')
                }
            }
        })
    </script>
</body>
</html>